Abstract
The paper investigates the problem of Structural Health Monitoring of composite patch repairs used in aerospace applications. The vibro-acoustic modulation technique (VAM) is applied to evaluate structural health of test samples with simulated damage. The VAM is a nonlinear ultrasonic technique based on the nonlinear modulations of two wave fields caused by the presence of damage. Test samples are made of Carbon Fiber Reinforced Polymer (CFRP) bonded patch repairs applied on aluminum and CFRP substrates. Damage is simulated by placing Teflon inserts of different sizes and locations during the manufacturing of repair patches. After manufacturing, ultrasonic C-scan and vibrothermography are used to confirm the presence and the locations of debondings caused by Teflon inserts. Subsequently the VAM technique is applied using surface bonded piezo ceramic transducers for excitation and laser Doppler vibrometer for vibration sensing. The paper shows that it is feasible to apply the vibro-acoustic modulation technique to detect the presence of damage in the analyzed samples. The paper discusses technical details of the measurement technique and provides detailed description of the analyzed test samples.
| Original language | English |
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| Title of host publication | 26th International Conference on Adaptive Structures and Technologies, ICAST 2015 |
| Publication status | Published - 2015 |